Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Emergency services are appropriate for severe breathing difficulty, uncontrolled bleeding, a seizure, fainting, or sudden neurologic symptoms.
And for anyone, someone who:
Contact the oncology team promptly for fever, new bleeding, worsening bruising, persistent vomiting, reduced urination, new rash, severe headache, confusion, weakness, or other symptoms listed in the team's instructions.
And for anyone, someone who:
During active treatment, follow-up is frequent and includes examinations, blood counts, chemistry tests, and checks for infection or organ problems.
Bone marrow examinations and MRD testing are performed at key points to measure response.
Follow-up remains important for detecting relapse, monitoring delayed treatment effects, reviewing medicines, and supporting recovery.
The care team may address vaccination, heart and bone health, fertility, sexual health, fatigue, anxiety, work, and financial concerns.
Routine questions about fatigue, sleep, nutrition, activity, work, fertility, or mild ongoing side effects can usually be discussed at scheduled visits unless symptoms are worsening.
The article also says
After treatment, visit frequency usually decreases over time.
Every sign above is quoted from the sofidex article on B-cell acute lymphoblastic leukemia for adults. If you are not sure, err upward — it is always reasonable to be checked.